Daytime Running Lamps (DRL) Headlamps Inoperative. GMC Truck Jimmy

Disconnect C211 at the steering column.
Connect a fused jumper between terminal E12 (YEL) and terminal E13 (YEL) in order to bypass the multifunction switch.

Do the headlamps light?

Go to Step 15

Go to Step 18

Inspect the integrity of the terminals.

Are the terminals in need of repair?

Go to Step 16

Go to Step 17

Repair the terminals as necessary.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Replace the multifunction switch.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Remove the Headlamp Ground Relay.
Connect a J 39200 digital multimeter (DMM) from pin 30 at the Headlamp Ground Relay to pin E13 at the multifunction Switch.

Is the resistance less than the specified value?

1 ohms

Go to Step 20

Go to Step 19

Locate and repair the open in CKT 10 (YEL) between the Multifunction Switch and the underhood fuse block.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Replace the connector at the Multifunction Switch.
Connect a J 39200 DMM between relay terminal 30 and terminal 87A of the Headlamps Ground Relay.

Is the resistance less than the specified value?

1 ohms

Go to Step 21

Go to Step 22

Locate and repair the open in CKT 350 (BLK) between the underhood fuse block and G102.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Replace the Headlamp Ground Relay.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Daytime Running Lamps (DRL) Headlamps Inoperative Envoy

Step

Action

Value(s)

Yes

Did you perform the DRL System Check?

Go to Step 2

Go to Daytime Running Lights (DRL) System Check

Disconnect the low beam relay.
Connect a J 39200 digital multimeter (DMM) between cavity 30 at the low beam relay and ground.

Is the voltage equal to the specified value?

Battery Voltage

Go to Step 3

Go to Step 19

Connect a test lamp between low beam relay cavity 86 and ground.
Move the headlamp switch to the HEAD position.

Does the test lamp illuminate?

Go to Step 4

Go to Step 10

Temporarily remove the RT HI fuse.
Connect a J 39200 DMM between low beam relay cavity 85 and ground.

Is the resistance less than the specified value?

1 ohms

Go to Step 5

Go to Step 9

Reinstall the RT HI fuse.
Reinstall the low beam relay.
Move the headlamp switch to the HEAD position.
Connect a test lamp between ground and each exposed test point on the back of both the RT LOW and LT LOW fuses.

Does the test light illuminate on at least one test point on each fuse?

Go to Step 25

Go to Step 6

Disconnect the low beam relay.
Connect a J 39200 DMM between cavity 87 and each exposed test point on the back of both the RT LOW and LT LOW fuses.

Is the resistance less than or equal to the specified value at each fuse?

1 ohms

Go to Step 7

Go to Step 8

Replace the low beam relay.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Replace the underhood fuse block.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Locate and repair the open in one of the following locations:

•	CKT 350 (BLK)

•	The terminals

•	The underhood fuse block

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Connect a test lamp between ground and both exposed test points on the back of the HDLP SW fuse.

Does the test lamp illuminate at both test points?

Go to Step 14

Go to Step 11

Does the test lamp illuminate at either test point?

Go to Step 12

Go to Step 13

Locate and repair the short to ground in the circuit between the HDLP SW fuse and the low beam relay.
Replace the HDLP SW fuse.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Locate and repair the open in power feed to HDLP SW fuse. Refer to

Cell 10: AUX PWR, RDO BATT and HDLP SW Fuses

Cell 10: INT BATT Fuse
Power and Grounding Components
Cell 10: HTD SEAT, ATC, HVAC and A/C Fuses
Cell 10: Inadvertent Power Lamp Relay
Entertainment Connector End Views
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
in Wiring Systems.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Disconnect the headlamp switch.
Connect a fused jumper between CKT 1940 (ORN), cavity D and CKT 103 (WHT), cavity C at the headlamp switch connector.
Connect a test lamp between the low beam relay cavity 86 and ground.

Did the test lamp illuminate?

Go to Step 15

Go to Step 16

Replace the headlamp switch.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Connect a test lamp between ground and CKT 1940 (ORN), cavity D at the headlamp switch connector.

Does the test lamp illuminate?

Go to Step 17

Go to Step 18

Locate and repair the open in CKT 103 (WHT).

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Locate and repair the open in CKT 1940 (ORN).

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Inspect the charging system. Refer to Charging System Check in Engine Electrical.

Is the charging system functioning properly?

Go to Step 21

Go to Step 20

Repair the charging system.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Connect the test leads and the test lead adapters to the J 39200 DMM.
Connect the leads of the J 39200 DMM together. Set the J 39200 DMM to the ohms scale.
Record this value. Subtract this value from all resistance readings. If the meter you are using has a zeroing function, zero the meter.
Disconnect the battery positive cable.

Notice: Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test Kit in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals.

When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616 GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size.

Connect a J 39200 DMM between the battery positive cable and cavity 30 at the low beam relay.

Is the resistance less than or equal to the specified value?

1 ohms

Go to Step 24

Go to Step 22

Inspect for a high resistance between the battery positive cable and the low beam relay.

Is a high resistance present?

Go to Step 23

Go to Step 31

Repair the high resistance between the battery positive cable and the low beam relay.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Reconnect the battery positive cable.
Reconnect the low beam relay.
Turn the headlamp switch to the HEAD position.

Do the HID headlamps illuminate?

Go to Daytime Running Lights (DRL) System Check

Go to Step 33

Remove the underhood fuse block and the hold down bolts.
Flip the underhood fuse block over.
Disconnect connector C4.
Inspect the cavities and terminals for damaged or corroded connections.

Are the connections OK?

Go to Step 27

Go to Step 26

Repair the poor connection(s) in connector C4 as necessary.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Remove the cover from connector C4.
Reconnect the connector C4 to the underhood fuse block.
Connect a J 39200 DMM between cavity 87 at the low beam relay socket and terminal B2 on the underside of the underhood fuse block at connector C4.

Does the resistance equal the specified value?

1 ohms

Go to Step 28

Go to Step 29

Connect a J 39200 DMM between cavity 87 at the low beam relay socket and terminal B1 on the underside of the underhood fuse block at connector C4.

Does the resistance equal the specified value?

1 ohms

Go to Step 32

Go to Step 29

Inspect for a high resistance in the underhood fuse block connection.

Is the connection OK?

Go to Step 31

Go to Step 30

Repair the high resistance in the underhood fuse block connection.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Replace the underhood fuse block.

Is the repair complete?

Go to Daytime Running Lights (DRL) System Check

Replace the low beam relay.
Move the headlamp switch to the HEAD position.

Do the HID headlamps illuminate?

Go to Daytime Running Lights (DRL) System Check

Go to Step 33

At this point, you have inspected every component and wiring path that is common to both HID headlamps.

You have inspected the system for an open or high resistance in the following components:

•	The power supply to the underhood fuse block

•	The input from the headlamp switch to the low battery relay

•	The ground to the low beam relay

•	The low beam relay to each low beam fuse

•	The circuitry within the underhood fuse block to each low beam fuse

Since this symptom is for both HID inoperative, the possibility that both of each of the following components is defective is unlikely:

•	Both ballast grounds

•	Both arc tube assemblies

•	Both ballasts

•	Both sets of wiring

This possibility does exist, however.

Is all of the above statement true?

Go to Headlamps Inoperative - Left Low Beam or Headlamps Inoperative - Right Low Beam